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Segments International Revenue (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Geographic									103743000	79765000	66160
Revenues	$ 53,829us-gaap_Revenues	$ 46,719us-gaap_Revenues	$ 44,368us-gaap_Revenues	$ 40,913us-gaap_Revenues	$ 38,871us-gaap_Revenues	$ 36,813us-gaap_Revenues	$ 35,527us-gaap_Revenues	$ 33,626us-gaap_Revenues	$ 185,829us-gaap_Revenues	$ 144,837us-gaap_Revenues	$ 117,791us-gaap_Revenues
percentage of total revenue									100.00%pro_PercentageOfTotalRevenue	100.00%pro_PercentageOfTotalRevenue	100.00%pro_PercentageOfTotalRevenue
International Revenue [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
percentage of total revenue									56.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_InternationalRevenueMember	55.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_InternationalRevenueMember	56.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_InternationalRevenueMember
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									82,086us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	65,072us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	51,631us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
percentage of total revenue									44.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = country_US	45.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = country_US	44.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = country_US
South America and Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									15,365us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_SouthAmericaAndCanadaMember	12,222us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_SouthAmericaAndCanadaMember	5,457us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_SouthAmericaAndCanadaMember
percentage of total revenue									8.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_SouthAmericaAndCanadaMember	8.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_SouthAmericaAndCanadaMember	5.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_SouthAmericaAndCanadaMember
North and South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									97,451us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_NorthandSouthAmericaMember	77,294us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_NorthandSouthAmericaMember	57,088us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_NorthandSouthAmericaMember
percentage of total revenue									52.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_NorthandSouthAmericaMember	54.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_NorthandSouthAmericaMember	49.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_NorthandSouthAmericaMember
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									45,987us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	33,666us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	31,545us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
percentage of total revenue									25.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	23.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	27.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									34,170us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_PacificMember	22,411us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_PacificMember	15,356us-gaap_Revenues / us-gaap_StatementGeographicalAxis = pro_PacificMember
percentage of total revenue									18.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_PacificMember	15.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_PacificMember	13.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = pro_PacificMember
Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									6,239us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	9,840us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	10,914us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
percentage of total revenue									3.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	7.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember	9.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_MiddleEastMember
Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 1,982us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember	$ 1,626us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember	$ 2,888us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember
percentage of total revenue									1.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember	1.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember	2.00%pro_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AfricaMember

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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